Calculus (3rd Edition)

Published by W. H. Freeman
ISBN 10: 1464125260
ISBN 13: 978-1-46412-526-3

Chapter 11 - Infinite Series - 11.7 Taylor Series - Exercises - Page 589: 60

Answer

The series converges to $5$, that is $\mathop \sum \limits_{n = 0}^\infty \dfrac{{{{\left( {\ln 5} \right)}^n}}}{{n!}} = 5$

Work Step by Step

From Table 2 we have ${{\rm{e}}^x} = \mathop \sum \limits_{n = 0}^\infty \dfrac{{{x^n}}}{{n!}} = 1 + x + \dfrac{{{x^2}}}{{2!}} + \dfrac{{{x^3}}}{{3!}} + \dfrac{{{x^4}}}{{4!}} + \cdot\cdot\cdot$, ${\ \ \ }$ converges for all $x$. Substituting $x = \ln 5$, we get ${{\rm{e}}^{\ln 5}} = \mathop \sum \limits_{n = 0}^\infty \dfrac{{{{\left( {\ln 5} \right)}^n}}}{{n!}}$ Since ${{\rm{e}}^{\ln 5}} = 5$, so the series converges to $5$, that is $\mathop \sum \limits_{n = 0}^\infty \dfrac{{{{\left( {\ln 5} \right)}^n}}}{{n!}} = 5$
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